Santa's known for his timeless cunning (6)
I believe the answer is:
sleigh
'santa's known for his timeless cunning' is the definition.
Although both the answer and definition are singular nouns, I cannot understand how one could define the other.
This is all the clue.
Can you help me to learn more?
(Other definitions for sleigh that I've seen before include "Horse-drawn sledge" , "Travel over snow" , "Vehicle suitable for snow" , "Carriage to run on snow" , "Toboggan" .)